Nokia handsets are advised to visit their nearest Nokia Center to upgrade their fones that are still using an old version of the Symbian OS.
This advice came after a code was discovered that could make your handset crash by recieving specially-formatted text message from other celfones.
The bug, called “Curse of Silence”, prevents incoming SMS messages from being received once a specially-formatted text has been received as demonstrated by Tobias Engel. Phones running Nokia’s S60 interface, versions 2.6 to 3.1, can be attacked in this way, and some models need a hard reset to recover.
Handsets, such as the N85, N96, 6650, are using S60 Feature Pack 2 and are therefore immune. However, if you’ve got one of the earlier models then you are strongly advise to upgrade your software before your tech-literate enemies who know your number start to irritate you.